package com.lingying.caiwudailikehudaun.utils.verificationUtils;


public class RandomUtils {


	//所有的字符组成的串
	public static final String allChar = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	//字符串（不包括数字）
	public static final String letterChar = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	//数字
	public static final String numberChar = "0123456789";
	//定义所有小写字符
	public static final String lowercase = "abcdefghijklmnopqrstuvwxyz";
	//定义所有大写字符
	public static final String bigChar = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	//定义特殊符号
	public static final String symbolChar = "!@#$%^&*()_+{}/*-";
	
	
	//从1到10的int型随数
	//(最小值+Math.random()*(最大值-最小值+1))
	//Math.random 0到1直接的小数
	public static int dsad() {
		return (int)(1+ Math.random()*(10-1+1));
	}
	//biggest为最大数   理论1-biggest
	public static int sdads(int biggest) {
		int num = (int)(Math.random()*biggest+1);
		return num;
	}

	//自定义length长度  所有的字符组成的串
	public static String getRandomString(int length){
		//StringBuffer 和 StringBuilder 类的对象能够被多次的修改，并且不产生新的未使用对象保证性能
		//在线程安全上，StringBuilder是线程不安全的，而StringBuffer是线程安全的
		StringBuffer sb=new StringBuffer();
		for(int i=0;i<length;i++){
			//注意：下标为从0开始
			int number=sdads(61);
			sb.append(allChar.charAt(number));
		}
		return sb.toString();
	}

	//自定义length长度   数字
	public static String getRandomInt(int length){
		StringBuffer sb=new StringBuffer();
		for(int i=0;i<length;i++){
			int number=sdads(9);
			sb.append(bigChar.charAt(number));
		}
		return sb.toString();
	}
	
	//自定义length长度   数字
		public static String getNumberCharInt(int length){
			StringBuffer sb=new StringBuffer();
			for(int i=0;i<length;i++){
				int number=sdads(9);
				sb.append(numberChar.charAt(number));
			}
			return sb.toString();
		}
}
